noun
burglar alarm; personal alarm
A portable or installed alarm device used to deter crime or call for help; often carried by children or elderly people for safety.
子供に防犯ベルを持たせる親が増えている。
More parents are giving their children personal alarms.
不審者に気づいたら、すぐに防犯ベルを鳴らしてください。
If you notice a suspicious person, sound your personal alarm immediately.